linux-kernel - Re: [PATCH v4 0/4] perf timechart io mode

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Message-ID: <20140624170153.GC10114@stfomichev-desktop.yandex.net>
Date:	Tue, 24 Jun 2014 21:01:53 +0400
From:	Stanislav Fomichev <stfomichev@...dex-team.ru>
To:	linux-kernel@...r.kernel.org
Cc:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	acme@...nel.org, namhyung@...nel.org, artagnon@...il.com,
	rusty@...tcorp.com.au, bp@...e.de, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH v4 0/4] perf timechart io mode

> For some reason, in Jiri's trace we see exit from sys_read with 2,
> and then again exit from sys_read with -EAGAIN:
>             xterm 32028 [000] 43390.908909: syscalls:sys_enter_read: fd: 0x00000004, buf: 0x02076e8c, count: 0x0
>             xterm 32028 [000] 43390.908917: syscalls:sys_exit_read: 0x2
>             xterm 32028 [000] 43390.908982: syscalls:sys_exit_read: 0xfffffffffffffff5
> 
> I'm not sure how it is possible (either we lost sys_enter, or timestamp
> of seconds -EAGAIN is wrong?). I think we might just convert this error
> to a warning (we couldn't reproduce it again).
> Should I resend the whole series (preferred) or add another patch on
> top?

Or probably left it as is, because perf.data is really weird...
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